With this one you'll be investigating the events of the Tunguska blast, as you look into its causes. This is very much a point and click game, so you'll need to have a proper dig around the surrounding when you're controlling either Nina Kalenkov or Max Gruber (no relation to Hans Gruber from Die Hard). Also, if you're having trouble finding smaller clues then you can activate the 'snoop key', which'll highlight everything in the surrounding area. HMV are parting with copies of the game for £7.99, which'll make you a saving of almost £5 on the next best offers out there.